Eight Hundred New Candidates for Globular Clusters in NGC 5128 (Centaurus A)

Details Eight Hundred New Candidates for Globular Clusters in NGC 5128 (Centaurus A) Eight Hundred New Candidates for Globular Clusters in NGC 5128 (Centaurus A)

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aj....143...84h&link_type=abstract

The Astronomical Journal, Volume 143, Issue 4, article id. 84 (2012).

Astronomy and Astrophysics

Astronomy

1

Galaxies: Elliptical And Lenticular, Cd, Galaxies: Individual: Ngc 5128, Galaxies: Star Clusters: General, Globular Clusters: General

Scientific paper

We have used new wide-field imaging with the Magellan IMACS camera to search for globular cluster (GC) candidates around NGC 5128, the nearest giant E galaxy. The imaging data are in the B and R broadband filters and cover a 1.55 deg2 field centered on the galaxy, corresponding to an area about 90 × 90 kpc2 at the distance of NGC 5128. All the fields were taken under exceptionally high-quality seeing conditions (FWHM = 0farcs4-0farcs5 in R). Using this material we are able, for the first time in the literature, to construct a homogeneous list of GC candidates covering a wide span of the NGC 5128 halo and unusually free of field contaminants (foreground stars and faint background galaxies). Selecting the measured objects by color, magnitude, ellipticity, and profile size gives us a final catalog of 833 new high-quality GC candidates brighter than R = 21 (0.8 mag fainter than the standard GC luminosity function turnover point). The measured positions have better than 0farcs2 precision in both coordinates. This list can be used as the basis for spectroscopic follow-up, leading to a more comprehensive kinematic and dynamic study of the halo.
This Paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.

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